Jeep Cherokee

 Service Manual

Fuel system » Fuel injection system » Description and operation
Extended idle switch-pcm input

DESCRIPTION

USED ONLY WITH OPTIONAL POLICE PACKAGE WHEN EQUIPPED WITH A 4.0L ENGINE: The extended idle switch is a rocker-type switch mounted to the instrument panel.

OPERATION

The extended idle switch is used to raise the engine idle speed to approximately 1000 rpm by supplying a ground circuit to the Powertrain Control Module (PCM). This idle speed control can only be operated when the shifter is in either the Park or Neutral position.

Powertrain control module (PCM)

Modes of operation

Automatic shutdown (asd) relay sense-pcm input

Battery voltage-pcm input

Brake switch-pcm input

Five volt sensor supplies-primary and secondary

Fuel level sensor-pcm input

Engine coolant temperature sensor-pcm input

Extended idle switch-pcm input

Oxygen sensor-pcm input

Ignition circuit sense-pcm input

Intake manifold air temperature sensor-pcm input

Manifold absolute pressure (map) sensor-pcm input

Oil pressure sensor-pcm input

Power grounds

Power steering pressure switch- pcm input

Sensor return-pcm input

Throttle position sensor (tps)-pcm input

Vehicle speed and distance sensor- pcm input

Auto shutdown (asd) relay-pcm output

CCD bus (+/-) circuits-pcm outputs

Data link connector-pcm input and output

Fuel injectors-pcm output

Fuel pump relay-pcm output

Idle air control (iac) motor-pcm output

Radiator fan relay-pcm output

Throttle body